This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A180624 #5 Feb 16 2025 08:33:13 %S A180624 1264460,3379784,6164364,11102500,18271604,36320580,54976960,83135125, %T A180624 129857825,210986457,385264277,594788487,924792067,1423007483, %U A180624 2659409715,4458691045,6846467595,9563962830,12443660134,16149431959 %N A180624 Partials sums of A090615. %C A180624 Partials sums of smallest member of sociable quadruples. Primes in this partial sum begin: 924792067, 16149431959. %H A180624 Eric W. Weisstein, <a href="https://mathworld.wolfram.com/SociableNumbers.html">Sociable Numbers</a> %F A180624 a(n) = sum[i=1..n] A090615(i). %e A180624 a(13) = 1264460 + 2115324 + 2784580 + 4938136 + 7169104 + 18048976 + 18656380 + 28158165 + 46722700 + 81128632 + 174277820 + 209524210 + 330003580 = 924792067 is prime. %Y A180624 Cf. A090615. %K A180624 nonn,less %O A180624 1,1 %A A180624 _Jonathan Vos Post_, Sep 13 2010